Talking about the importance of bearing lubrication

The use of bearings in the car is very extensive and has taken on a tense role. Bearings are used from the engine, the chassis, and the electrical assembly. Automotive bearings are divided into two categories: plain bearings and rotary bearings.
Sliding bearings are important for use on the engine. Sliding bearings are generally divided into two types, one is a lining type thin-walled bearing, which is similar to a tile commonly known as a bearing bush; the other is a bushing, also known as a copper sleeve, which is in the shape of a hollow cylinder. The lining type thin-walled bearings are important for supporting the crankshaft and connecting rods. Bushings are important for supporting camshaft journals and piston pins, but are also used in the rest of the car, such as the steering knuckle kingpin bushings, suspension steel pin bushings, gear bushings, and electromechanical bushings. Reduce the effects of the center body.
Crankshafts and connecting rod bearings look like tiled singles, but their performance requirements are high. Although there is a smooth system of smooth oil to separate the parts from the bearing surface, but compared with the year, the engine continues to grow at high speed and pressure, the oil film pressure of the bearing increases, the thickness of the oil film is reduced, and the environment of the bearing is improved. Requests for materials and fabrication of crankshaft and connecting rod bearings are also increasing. Generally, the bearing adopts the double-layer metal situation, and some of them are multi-layered. The first layer is the steel tile back to cover the machine strength, and the second layer is the bearing alloy to cover the general situation. It is often used as a kind of babbitt alloy. The third layer is further plated with an extremely thin alloy on the base of the above two layers to further improve the general function.
Compared with the bearing bush, the camshaft bushing has less stress than the force. Its material is usually plated with bronze or steel backing. The bushing of this material is also used in the kingpin, brake shoe, door hinge, Peaceful belts and other places. The bushing materials used in automobiles are more powerful, such as the oil-containing metal bushings for the idea head and the electric fan, the bushings made of the polymeric material on the shock-absorbing steel plate pin and the wiper, and the like.
Rotating bearings are used throughout the various machines and electrical assemblies used in automobiles. Important are transmissions, steering gears, pumps, fans, clutches, differentials, front and rear wheels and drive shafts.
The rotating bearing has two kinds of spherical and roller bearings. It is divided into radial bearing and thrust bearing according to the size of the load and the target. The radial bearing should be subjected to the radial (reccentric to the axial line) load, and the thrust bearing should be properly withstood. Axial (parallel to the axis) load, and a radial thrust bearing that is simultaneously subjected to radial and axial forces. In fact, almost all of the rotating bearings can now be subjected to both radial and lateral loads under certain conditions, but only on the one hand and the two. The rotary bearing is mainly divided into a ball bearing, a roller bearing and a needle bearing, and is divided into various parts of the automobile according to the influence difference.
The drive shaft of the transmission is usually supported at both ends. Because the transmission shaft has a longer specific force, it is planned to take the bearing on one side as the solid side bearing. It is subjected to both radial and axial loads, which plays a role in the relative axial displacement between the shaft and the gearbox. Adopt centripetal thrust ball bearings. The bearing on the other side is called a free-side bearing, and it is only subjected to radial load, and the axial direction can be relatively moved to handle the problem of the expansion and contraction of the shaft due to temperature change during the operation of the transmission gear and the deviation occurring during the installation. Column bearing.
The bearing ring and rotating element of the rotating bearing are generally made of high-purity special chrome alloy steel, and the hardness is quite high. However, if it is not smooth, improperly selected, or improperly placed, it may cause obstruction. However, even if the bearing is used under the premise of deformity, the rotating surface of the external component will cause embarrassment under the influence of the alternating compressive stress, so that the peeling is impossible to use, and the bearing has its life limit. The material supplied by NTN in Japan, even if it is a group of identical bearings operating under the same premise, its life span is also very different, which is because the material euphemism itself has "separability." Therefore, the nominal life of the so-called rotating bearing is a total number of revolutions or total torsion time when 90% (reliable 90%) does not produce a rotational euphemistic peeling when a set of identical bearings are fed in the same premise. The bearing seems to be a pivot point, and its quality is directly related to the running quality of the car. However, it is difficult to ensure that each bearing is completely above the uniform quality scale in the production of a large number of bearings. Some new vehicles will exhibit such types or obstacles early in the process of use. Timely lubrication is extremely important for the performance of the bearing. Because the lubricant or lubrication method is correct or not, it will greatly affect the life of the bearing.
The main effects of lubrication on the performance of the bearing are as follows:
1. Lubricate the various parts of the bearing to reduce the friction and wear of the bearing;
2. The heat generated by friction or other reasons inside the bearing is removed by lubrication;
3. The rolling contact surface of the bearing often forms an appropriate oil film to prolong the fatigue life of the bearing;
4, through the lubrication can achieve the role of anti-rust and dustproof bearings.
The lubrication method of the bearing is mainly divided into two ways: grease lubrication and oil lubrication.
Grease lubrication can be used after filling the grease for a long time without replenishing, and the structure of the sealing device is relatively simple, so it is widely used. Grease lubrication has a sealing method in which the sealed bearing is filled with grease in advance, and a filling and fat filling method in which the inside of the outer casing is filled with an appropriate amount of grease and replenished or replaced at intervals. In addition, for machines with multiple bearings that require lubrication, a centralized grease supply method that connects the pipes to each lubrication location is also used.
In short, it is necessary to lubricate the bearings in time, which will increase their service life.